The present study examines the relations between adolescent motherhood and children's behavior, substance use, and internalizing problems in a sample of 1,368 children of 712 female twins from Australia. Adolescent motherhood remained significantly associated with all mental health problems, even when using a quasiexperimental design capable of controlling for genetic and environmental confounds. However, the relation between adolescent motherhood and offspring behavior problems and substance use was partially confounded by family background variables that influence both generations. The results are consistent with a causal relation between adolescent motherhood and offspring mental health problems, and they highlight the usefulness of behavior genetic designs when examining putative environmental risks for the development of psychopathology. The generalizability of these results to the United States, which has a higher adolescent birth rate, is discussed.Correspondence concerning this article should be addressed to K. Paige Harden, Box 400400, Department of Psychology, University of Virginia, Charlottesville, VA 29904-4400. kph3k@virginia.edu.
NIH Public AccessAuthor Manuscript J Abnorm Psychol. Author manuscript; available in PMC 2010 July 14.
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NIH-PA Author ManuscriptKeywords adolescent motherhood; children-of-twins; teenage pregnancy; internalizing; externalizingThe most obvious correlate of adolescent childbearing is privation: Teenage mothers are twice as likely to be impoverished when adults (Hoffman, Foster, & Furstenberg, 1993) and more likely to receive welfare (Moore et al., 1993), although the extent to which these adverse economic outcomes are a product of adolescents' disadvantaged background, versus the pregnancy itself, is debated (Geronimus & Korenman, 1992;Lee & Gramotnev, 2006). In addition to the negative socioeconomic correlates of adolescent childbearing, the children of adolescent mothers are at elevated risk for diverse forms of psychopathology, including depressive and anxiety disorders (Hofferth, 1987;Moore, Morrison, & Greene, 1997), antisocial behavior, and other externalizing disorders (Jenkins, Shapka, & Sorenson, 2006;Levine, Pollack, & Comfort, 2001;Nagin, Pogarsky, & Farrington, 1997;Spieker, Larson, Lewis, Keller, & Gilchrist, 1999;Wakschlag et al., 2000). The disparity in adjustment between children of adolescent and adult mothers seems only to widen over children's life spans, with the most dramatic disparities evident in adolescence and adulthood (Brooks-Gunn & Furstenberg, 1986;Furstenberg, Brooks-Gunn, & Morgan, 1987).Consequently, several authors have concluded that a mother's age at her first birth influences her child's cognitive and psychosocial development and eventual adult adjustment. This has not remained a purely academic hypothesis: American organizations with disparate political ideologies, such as The Heritage Foundation (The Heritage Foundation, 2004) and Planned Parenthood (Planned Parenthood, 2006), pu...